23210111221 has 12 divisors (see below), whose sum is σ = 25579304800. Its totient is φ = 21044386440.

The previous prime is 23210111207. The next prime is 23210111273. The reversal of 23210111221 is 12211101232.

It is not a de Polignac number, because 23210111221 - 2²³ = 23201722613 is a prime.

It is a super-2 number, since 2×23210111221² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23210111195 and 23210111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23210112221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 207201 + ... + 298918.

Almost surely, 2^23210111221 is an apocalyptic number.

It is an amenable number.

23210111221 is a deficient number, since it is larger than the sum of its proper divisors (2369193579).

23210111221 is a wasteful number, since it uses less digits than its factorization.

23210111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506520 (or 506509 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 23210111221 its reverse (12211101232), we get a palindrome (35421212453).

It can be divided in two parts, 2321011 and 1221, that added together give a palindrome (2322232).

The spelling of 23210111221 in words is "twenty-three billion, two hundred ten million, one hundred eleven thousand, two hundred twenty-one".